[Crash-utility] [PATCH] arm64: fix the determination of vmemmap and struct_page_size
Currently, the vmemmap ptr addr is determined by the vmcoreinfo of
"SYMBOL(vmemmap)", which leads to an invalid vmemmap addr showed by "help
-m" for dump files without the vmcoreinfo. The value of vmemmap_end is simply set to
-1 for available VA_BITS_ACTUAL case in arm64_calc_virtual_memory_ranges(), and the
struct_page_size value is 0.
crash> help -m |grep vmem
vmemmap_vaddr: fffffffeffe00000
vmemmap_end: ffffffffffffffff
vmemmap: 0000000000000000
crash> help -m |grep struct_page_size
struct_page_size: 0
Introduce arm64_get_vmemmap_page_ptr() to fix the determination of vmemmap ptr addr, and
fix the determination of vmemmap_end and struct_page_size in
arm64_calc_virtual_memory_ranges().
crash> help -m |grep vmem
vmemmap_vaddr: fffffffeffe00000
vmemmap_end: ffffffffffe00000
vmemmap: fffffffefee00000
crash> help -m |grep struct_page_size
struct_page_size: 64
Signed-off-by: qiwu.chen <qiwu.chen(a)qq.com>
---
arm64.c | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/arm64.c b/arm64.c
index 78e6609..ef495ec 100644
--- a/arm64.c
+++ b/arm64.c
@@ -159,7 +159,6 @@ arm64_vmemmap_is_page_ptr(ulong addr, physaddr_t *phys)
ulong size = SIZE(page);
ulong pfn, nr;
-
if (IS_SPARSEMEM() && (machdep->flags & VMEMMAP) &&
(addr >= VMEMMAP_VADDR && addr <= VMEMMAP_END) &&
!((addr - VMEMMAP_VADDR) % size)) {
@@ -175,6 +174,25 @@ arm64_vmemmap_is_page_ptr(ulong addr, physaddr_t *phys)
return FALSE;
}
+static void arm64_get_vmemmap_page_ptr(void)
+{
+ struct machine_specific *ms = machdep->machspec;
+
+ /* If vmemmap exists, it means kernel enabled CONFIG_SPARSEMEM_VMEMMAP */
+ if (arm64_get_vmcoreinfo(&ms->vmemmap, "SYMBOL(vmemmap)", NUM_HEX))
+ goto out;
+
+ /* The global symbol of vmemmap is removed since kernel commit 7bc1a0f9e1765 */
+ if (!kernel_symbol_exists("vmemmap"))
+ ms->vmemmap = ms->vmemmap_vaddr - ((ms->phys_offset >>
machdep->pageshift) * ms->struct_page_size);
+ else
+ ms->vmemmap = symbol_value("vmemmap");
+
+out:
+ if (ms->vmemmap)
+ machdep->is_page_ptr = arm64_vmemmap_is_page_ptr;
+}
+
/*
* Do all necessary machine-specific setup here. This is called several times
* during initialization.
@@ -443,10 +461,6 @@ arm64_init(int when)
machdep->stacksize = ARM64_STACK_SIZE;
machdep->flags |= VMEMMAP;
- /* If vmemmap exists, it means kernel enabled CONFIG_SPARSEMEM_VMEMMAP */
- if (arm64_get_vmcoreinfo(&ms->vmemmap, "SYMBOL(vmemmap)", NUM_HEX))
- machdep->is_page_ptr = arm64_vmemmap_is_page_ptr;
-
machdep->uvtop = arm64_uvtop;
machdep->is_uvaddr = arm64_is_uvaddr;
machdep->eframe_search = arm64_eframe_search;
@@ -498,6 +512,7 @@ arm64_init(int when)
if (!ms->struct_page_size)
arm64_calc_virtual_memory_ranges();
+ arm64_get_vmemmap_page_ptr();
arm64_get_section_size_bits();
if (!machdep->max_physmem_bits) {
@@ -4841,6 +4856,7 @@ arm64_calc_virtual_memory_ranges(void)
return;
STRUCT_SIZE_INIT(page, "page");
+ ms->struct_page_size = SIZE(page);
switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K))
{
@@ -4868,7 +4884,8 @@ arm64_calc_virtual_memory_ranges(void)
vmemmap_start = (-vmemmap_size - MEGABYTES(2));
ms->vmalloc_end = vmalloc_end - 1;
ms->vmemmap_vaddr = vmemmap_start;
- ms->vmemmap_end = -1;
+ ms->vmemmap_end = vmemmap_start + vmemmap_size;
+
return;
}
--
2.25.1